What are the symptoms shown by a person if
$(i)$ Lungs get infected?
$(ii)$ Stomach is infected?

State whether the following statement is true or false:
High blood pressure and cancer have mostly external causes and are generally caused by infectious agents.

$(a)$ Why do parents immunize their newborn babies?
$(b)$ What are the ways to prevent mosquitoes from breeding?

Name two diseases caused by protozoans. What are their causal organisms?

It was diagnosed that a patient has lost the power of fighting against any infection.
$(i)$ Name the disease from which the patient is suffering.
$(ii)$ Name the pathogen responsible for the disease.

What is inflammation? Write the symptoms of this in the human body.